新型预应力钢带-自攻螺钉胶合木拼接节点力学性能研究

刘红波; 邱灿; 赵敬贤; 李文杰; 史杰; 刘浩男; 陈志华

doi:10.3724/j.gyjzG23030403

新型预应力钢带-自攻螺钉胶合木拼接节点力学性能研究

doi: 10.3724/j.gyjzG23030403

1. 河北工程大学土木工程学院, 河北邯郸 056038;
2. 天津大学滨海土木工程结构与安全教育部重点实验室, 天津 300072;
3. 中国建筑设计研究院有限公司, 北京 100044

基金项目:

河北省全职高端人才引进项目(2020HBQZYC013)。

详细信息

作者简介:
刘红波,博士,教授,主要从事钢结构和空间结构方面的研究。电子信箱:hbliu@tju.edu.cn

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出版历程
- 收稿日期: 2023-03-04
- 网络出版日期: 2025-03-28

Research on Mechanical Properties of a New Type of Glued Laminated Timber Splice Joints Connected with Prestressed Steel Strip and Self-Tapping Screw

1. Department of Civil Engineering, Hebei University of Engineering, Handan 056038, China;
2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China;
3. China Architecture Design & Research Group, Beijing 100044, China

摘要

摘要: 针对胶合木拼接节点易发生上搭接半梁木材受弯劈裂破坏的问题,提出一种新型预应力钢带-自攻螺钉胶合木拼接节点,并进行了轴压荷载下的抗弯试验研究,得到试件裂缝发展情况及破坏形态,并基于弯矩-转角曲线分析了该新型节点的力学性能。试验结果表明:节点破坏模式主要为水平斜向自攻螺钉的拔出破坏,肩角处裂缝得到了明显限制,该新型节点的承载力是完整胶合木梁的72.5%,相比于无水平斜向自攻螺钉的胶合木拼接节点梁,其抗弯承载力提高11.3%。针对自攻螺钉实体模型运算复杂、效率较低的问题,提出一种实体模型和简化模型的组合建模方法,基于试验结果验证了模型有效性,并提出一种完全简化建模方法,进一步提高了计算效率。
- 预应力钢带 /
- 自攻螺钉 /
- 胶合木 /
- 试验研究 /
- 有限元分析
Abstract: A new type of laminated timber joint connected with prestressed steel strips and self-tapping screws is proposed to address the problem of bending and splitting of half-lapped beams in the laminated wood joint. An experimental study on the bending resistance of the joint under axial compression load was conducted, and the crack propagation and failure modes of the specimen were obtained. The mechanical properties of the new type of joints were analyzed based on the bending moment-deflection curve. The test results showed that the failure modes of the joint were mainly the pull-out failure of the horizontally oblique self-tapping screw, and the cracks at the shoulder angle were significantly restricted. The bearing capacity of the new type of joints was 72.5% of that of the intact laminated timber beams, compared to the glued laminated timber joint beams without horizontal inclined self-tapping screws, their bending load-bearing capacity has increased by 11.3%.To address the problem of complex and inefficient computation of the solid model of the self-tapping screw, a combination of solid and simplified models was proposed in the paper. The model’s validity was verified based on the test results, and a fully simplified modeling method was proposed to further improve the calculation efficiency.
- pre-stressed steel band /
- self-tapping screw /
- glued laminated timber /
- experimental study /
- finite element analysis

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参考文献(15)

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